Kicker 46KISLOC2
4.5Editor score
Simple wire tap installation
Remote turn-on output
Affordable price point
In this guide
Adding a subwoofer to a factory car audio system often requires converting high-level speaker signals into low-level RCA signals. A quality line out converter ensures your aftermarket amplifier receives the clean signal it needs to perform its best without distortion or signal loss.
We have evaluated ten leading models based on signal fidelity, ease of installation, build quality, and specific features like remote bass control or automatic turn-on capabilities. Our analysis covers options ranging from budget-friendly basics to premium units with advanced bass restoration technology.
Each pick below highlights key strengths and ideal use cases to help you match a converter to your specific vehicle and amplifier setup. Please note that product availability and pricing can change frequently, so always check current listings before making a purchase decision.
Top 3 Picks for Best Line Out Converter Subwoofer
AudioControl LC2i
4.6Editor score
AccuBASS technology included
Up to 400 watts input
Compact slim chassis design
SVS SoundPath
4.3Editor score
Gold plated binding posts
High current handling
No power draw from amp
Top 10 Best Line Out Converter Subwoofer in 2026 Compared
The table below provides a side-by-side look at the core specifications and features of each model to help you quickly compare capabilities like frequency response, input power handling, and included accessories across the entire lineup.
ProductsSpecificationsEditor scorePrice
Best Budget
Kicker 46KISLOC2
100mA Remote Turn-on
55 Watts Input Signal
Stereo Line Output
DC Offset Technology
4.5Editor score
Editor's Choice
CT Sounds CT-LC2
BassLift Technology
Full Range Main Output
Low Pass Bass Output
Step-By-Step Manual
4.4Editor score
Best Premium
Scosche LOC2SL
Remote Control Knob
2CH High/Low RCA
Compact Durable Design
Lifetime Tech Support
4.4Editor score
Skar Audio SKE2LOC
Active Line Converter
Selectable Turn-On Options
Adjustable Bass Control
Remote Level Control
4.5Editor score
NuIth Car Audio
Level Gain Adjustment
Speaker to RCA Adapter
Easy Install Relay
Neat Power Plug
4.4Editor score
AudioControl LC1i
400W Input Handling
Ground Isolation Switch
Onboard Load Switch
Slim 4.8 Inch Chassis
4.7Editor score
Skar Audio SKAR2CH-LOC
8 Volts RMS Output
60 Ohm Load
20Hz to 20kHz
OEM & Smart Radios
4.5Editor score
AudioControl LC2i
AccuBASS Technology
400 Watts Per Channel
Steering Wheel Retention
Integrated Mounting Brackets
4.6Editor score
SVS SoundPath
24K Gold Plated
30 dBV Attenuation
Wide Trace PCBs
No Fidelity Loss
4.3Editor score
NVX XLCA2
xBOOST Technology
9.5V Pre-Out
Auto-On Efficiency
Remote Bass Knob
4.5Editor score
1. AudioControl LC2i – Best Overall Line Out Converter Subwoofer
AudioControl LC2i
400W Input Handling
AccuBASS Technology
Steering Wheel Controls
Integrated Brackets
The AudioControl LC2i stands out as a top performer for car audio enthusiasts seeking precision and versatility in their signal conversion setup. With a robust rating reflecting consistent performance, it offers advanced features like AccuBASS technology that actively corrects bass roll-off when factory volume levels are adjusted.
Pros
- AccuBASS restores bass
- Handles high power input
- Compact slim design
- Remote knob optional
- Factory features retained
Cons
- Premium price point
- Remote sold separately
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Its key strengths include the ability to handle up to 400 watts of input power per channel, ensuring it can manage even high-output factory amplifiers without signal degradation. The unit maintains essential factory features such as steering wheel controls and volume adjustment, which is a critical benefit for modern vehicles where integration is key.
While the price is higher than basic models, the trade-off is justified by the superior build quality and the inclusion of adjustable gains that allow for precise tuning of your subwoofer system. The lack of an included remote knob may require an extra purchase for some users who want dashboard control, but the device itself is fully functional without it.
This converter is ideal for anyone upgrading a factory system who wants to preserve stock functionality while gaining the full power and control of an aftermarket amplifier. If you value sound fidelity and ease of integration, the LC2i is a strong recommendation.
AccuBASS Bass Restoration
This technology corrects bass roll-off when factory volume increases, ensuring deep lows remain consistent regardless of how loud you play your system.
Factory Feature Retention
The unit retains important factory features like steering wheel controls so you do not lose convenience while upgrading your audio power.
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2. Kicker 46KISLOC2 – Best Budget Line Out Converter Subwoofer
Kicker 46KISLOC2
55 Watts Input
DC Offset Technology
100mA Remote Out
Speaker Tap Install
The Kicker 46KISLOC2 is a highly accessible option for those looking to add a subwoofer to their vehicle without breaking the bank. It delivers true sonic accuracy by converting speaker signals effectively, ensuring your amplifier receives the necessary voltage to drive low frequencies cleanly.
Pros
- Affordable price
- Simple installation
- Remote turn-on included
- Reliable K-series quality
- Accurate sonic output
Cons
- Basic feature set
- Limited input power
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Its standout feature is the use of DC offset technology, which automatically generates a remote turn-on signal from your factory speaker wires. This eliminates the need to hunt for a separate accessory wire, making the installation process significantly faster and cleaner for DIY installers.
While it does not offer advanced bass restoration or gain controls, it performs its primary function of signal conversion with reliability. The main trade-off is its lower input power handling compared to premium units, which may limit compatibility with very high-power factory systems.
Buy this unit if you have a standard factory radio and want a cost-effective, plug-and-play solution that includes the essential remote wire for amp activation. It is a trusted choice for straightforward upgrades.
DC Offset Remote Output
The unit creates a remote wire signal from speaker wires so you can easily turn on your amplifier without extra routing.
Sparkling Highs and Lows
It preserves the full range of your original audio ensuring that highs remain clear while bass output is thunderous.
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3. SVS SoundPath – Best Premium Line Out Converter Subwoofer
SVS SoundPath
Gold Plated Terminals
No Power Draw
High Power Handling
RCA Line Output
The SVS SoundPath offers a premium take on the line out converter concept, prioritizing signal purity and build quality above all else. It is designed to convert speaker-level outputs to line-level RCA signals without any loss of fidelity, making it ideal for audiophiles who demand the best performance.
Pros
- No fidelity loss
- Premium build quality
- Gold plated connectors
- Wide trace PCBs
- Secure connections
Cons
- Higher price
- Home audio focus
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Its construction features premium grade narrow-tolerance resistors and wide-trace PCBs, which ensure high-current handling and stability. The use of 24K gold-plated binding posts and RCA jacks provides secure, corrosion-resistant connections that are essential for maintaining signal integrity over time.
One distinct advantage is that it does not draw any power from the loudspeaker amplifier, relying on attenuation rather than active processing. This passive design simplifies wiring in some scenarios, though it comes at a price point significantly higher than standard car audio converters.
This adapter is best suited for high-end home or car audio systems where signal purity is paramount. If you are willing to invest in top-tier components to ensure your subwoofer gets the cleanest possible signal, the SVS SoundPath is an excellent choice.
Zero Fidelity Loss
The adapter solves the problem of adding subwoofers to legacy amps by converting signals with absolutely no loss of audio quality.
Gold Plated Connections
24K gold plating on both input and output terminals ensures you get secure connections that resist corrosion.
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4. CT Sounds CT-LC2 – Strong Bass Enhancement Line Out Converter Subwoofer
CT Sounds CT-LC2
BassLift Technology
Full Range Output
Low Pass Output
Detailed Manual
The CT Sounds CT-LC2 is designed to address the common issue of bass roll-off in factory car audio systems through its dedicated BassLift technology. This feature compensates for the loss of low frequencies that often occurs when the volume is increased on the head unit.
Pros
- Restores factory bass
- Dual output options
- Easy installation guide
- Premium build quality
- Reliable performance
Cons
- Mid-range pricing
- No remote knob
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It provides both a full-range main output for front speakers and a low-pass bass output specifically for subwoofers. This separation allows for more flexible integration with aftermarket amplifiers and helps keep your signal chain organized and efficient.
While it may lack the sophisticated controls of high-end models, the CT-LC2 offers a solid balance of performance and usability. The included step-by-step manual is a helpful resource for those less familiar with automotive electrical wiring.
Choose this converter if you need to restore bass response and want a unit that offers distinct outputs for different parts of your audio system. It is a practical choice for mid-range upgrades.
BassLift Technology
This technology restores or compensates for factory bass roll-off so your subwoofer gets proper low-frequency signals.
Step-By-Step Manual
A detailed thirty-four page manual is included to guide you through installation with clear instructions.
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5. Scosche LOC2SL – Convenient Remote Knob Line Out Converter Subwoofer
Scosche LOC2SL
Remote Control Knob
High to Low RCA
Compact Design
Lifetime Support
The Scosche LOC2SL stands out for including a physical remote control knob that allows for easy adjustments from the driver's seat. This feature adds a layer of convenience that many budget units omit, enabling you to tweak bass levels on the fly.
Pros
- Remote knob included
- Compact build
- OEM quality signals
- Easy integration
- Reliable brand
Cons
- Basic bass control
- Limited advanced features
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It is engineered to seamlessly integrate your factory stereo with an aftermarket amplifier while ensuring no loss of sound quality. The compact and durable design means it can fit easily into tight spaces behind a dashboard without causing installation issues.
While it does not offer high-end signal processing, it delivers crisp and clear sound quality suitable for most subwoofer applications. The lifetime tech support and warranty from Scosche provide additional peace of mind for long-term use.
This unit is a great pick for those who value convenience and want to adjust their bass without touching the amplifier. It is a reliable upgrade for any car audio enthusiast looking for ease of use.
Remote Control Knob
A built-in remote knob lets you adjust bass levels directly from the dash without needing to access the amplifier.
Compact and Durable Design
The unit is built to last and is small enough to fit into tight spaces in your vehicle.
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6. Skar Audio SKE2LOC – Flexible Turn-On Options Line Out Converter Subwoofer
Skar Audio SKE2LOC
Active Converter
Selectable Turn-On
Adjustable Bass
Frequency Response
The Skar Audio SKE2LOC is an active converter that provides a high degree of flexibility for installation and tuning. It offers selectable turn-on options including DC offset signal sense and audio sense, allowing you to match the device to your specific vehicle's wiring setup.
Pros
- Multiple turn-on modes
- Adjustable bass control
- Included remote control
- Wide frequency range
- Active signal processing
Cons
- Higher price point
- More complex setup
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Features like fully adjustable bass control and main channel control give you significant influence over your sound signature. The unit handles a wide frequency response range ensuring that both highs and lows are preserved during the conversion process.
While this added functionality comes at a higher price point, it is worth it for those who want precise control over their system. The inclusion of a remote level control adds further convenience for adjusting bass levels on the go.
Consider this model if you need an active solution that can adapt to various turn-on methods and provide detailed tuning capabilities. It is a robust choice for complex audio setups.
Selectable Turn-On Options
Choose between DC offset, audio sense, or remote 12V output to match your vehicle wiring.
Fully Adjustable Controls
Controls for bass and main channel allow you to tailor the audio output to your specific needs.
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7. NuIth Car Audio – Simple Gain Adjustment Line Out Converter Subwoofer
NuIth Car Audio
Level Gain Adjustment
Speaker to RCA
Auto Relay
Compact Power
The NuIth Car Audio converter offers a straightforward solution for adding an amplifier to a stock stereo. It allows you to convert high voltage speaker signals into low voltage RCA signals with minimal fuss, making it accessible for beginners.
Pros
- Gain adjustment included
- Simple installation
- Automatic turn-on
- Affordable option
- Clean sound output
Cons
- Basic construction
- Limited feature set
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A convenient feature is the level gain adjustment which lets you lower the bass signal without pulling over to adjust the amp manually. This helps in setting the initial gain levels safely and efficiently during the installation process.
It includes a relay that sends power to the amp when a signal is detected, simplifying the wiring needs significantly. While it is a budget option, it provides clean and excellent sound quality for standard setups.
Select this unit if you want an uncomplicated, affordable way to get an aftermarket subwoofer running with a factory radio. It is a practical choice for basic upgrades.
Level Gain Adjustment
Adjust the bass signal before it reaches the amplifier so you do not have to adjust settings while driving.
Convenient to Use
The device automatically senses the signal and turns on the amp which makes installation simpler.
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8. AudioControl LC1i – Compact Line Driver Line Out Converter Subwoofer
AudioControl LC1i
400W Input
Ground Isolation
Load Selection
Slim Chassis
The AudioControl LC1i is a reliable converter known for its compact slim chassis that saves valuable space in your vehicle. It handles up to 400 watts of input per channel and includes switches that allow you to select the correct load for factory amplifiers.
Pros
- Ground isolation switch
- High power handling
- Load switches included
- Slim design
- Remote Out trigger
Cons
- Basic remote not included
- Fixed gain knobs
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One of its most useful features is the selectable ground isolation switch which allows you to remove ground buzz or alternator whine. This helps in achieving a cleaner sound profile and is a common fix for electrical noise issues in cars.
While it is slightly simpler than the LC2i, it still offers a high line driver function to provide optimum signals for downstream amplifiers. The inclusion of a remote out signal allows this unit to trigger other devices in your signal chain.
This is a solid choice for those who need a small form factor and reliable signal processing without the extra cost of remote bass controls. It fits well in modern vehicles with limited space.
Ground Isolation Switch
Select the isolation switch to remove ground buzz and alternator whine for a cleaner audio experience.
Onboard Load Selection
Use the load switches to ensure factory amplifiers detect the correct speaker load in modern vehicles.
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9. Skar Audio SKAR2CH-LOC – Flat Frequency Response Line Out Converter Subwoofer
Skar Audio SKAR2CH-LOC
20Hz to 20kHz
8 Volts RMS
60 Ohm Load
55 Watts Input
The Skar Audio SKAR2CH-LOC is a straightforward converter designed to deliver a flat frequency response from 20Hz to 20kHz at all volume levels. This consistency ensures that your music sounds balanced whether you are playing at low or high volumes.
Pros
- Flat frequency range
- High voltage output
- Circumvents protection
- Wide compatibility
- Affordable price
Cons
- Basic design
- No extra features
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It applies a 60-ohm load to each channel which is a crucial feature for circumventing open-circuit protection in modern radios. Without this load, some factory head units may shut down or reduce power when speakers are disconnected for an amp.
The unit outputs up to 8 Volts RMS which provides a strong signal to push aftermarket amplifiers effectively. It is compatible with a wide range of radios making it a versatile choice for different vehicle types.
This model is a great value for those who want reliable signal conversion without unnecessary bells and whistles. It handles the essential tasks of load emulation and signal conversion effectively.
Flat Frequency Range
The converter maintains a flat 20Hz to 20kHz response so your audio stays balanced at all volume levels.
60-Ohm Load
Applying a load helps circumvent open-circuit protection in modern radios to ensure consistent signal.
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10. NVX XLCA2 – Digital Bass Enhancement Line Out Converter Subwoofer
NVX XLCA2
400 Watts RMS
xBOOST Technology
Remote Knob
Auto-On
The NVX XLCA2 distinguishes itself with xBOOST technology which optimizes the bass response in your system for a powerful low-end experience. This active enhancement helps provide deep bass with minimal distortion which is often a challenge with passive converters.
Pros
- Bass enhancement tech
- High power handling
- Auto-on feature
- Included remote
- Versatile outputs
Cons
- Price above basic
- Setup complexity
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It handles speaker-level inputs of up to 400 watts RMS ensuring that it can interface seamlessly with robust amplifiers. The Selectable Auto-On feature ensures that the unit only activates when your vehicle is in use which helps in saving battery power.
The included remote bass knob allows for convenient control over low-end output while driving. Additionally, versatile output options like 9.5V pre-out and dual amplifier outputs make it a flexible choice for complex setups.
Choose this model if you want active bass enhancement to get the most out of your subwoofer. It is a versatile tool for those who want to customize their sound significantly.
xBOOST Technology
This technology optimizes bass response providing a deep powerful bass experience with minimal distortion.
Selectable Auto-On
The device activates only when the vehicle is in use saving battery power and optimizing efficiency.
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Buying Guide – How to Choose the Best Line Out Converter Subwoofer
Choosing the right line out converter depends on your specific car audio needs and budget. This guide outlines the key factors you should evaluate to ensure you select a model that delivers quality sound and easy integration.
Input Power Handling
Check the maximum input voltage and wattage ratings of the converter to ensure it can handle the output of your factory radio or amplifier. If your system outputs high voltages you need a unit that supports at least 40 volts or 400 watts to avoid signal clipping or damage.
Always match the converter capabilities to your system output to ensure safe and reliable performance.
Remote Turn-On Capability
A line out converter should ideally generate a remote turn-on signal if your factory radio does not provide one. This signal tells your aftermarket amplifier when to switch on and off so you do not need to run extra wires to the fuse box.
Look for units with DC offset or audio sense features that automatically generate this signal from your speaker wires.
Signal Fidelity and Quality
The primary job of a converter is to transform speaker level signals to line level signals without adding noise or distortion. Premium models often include features like ground isolation or active buffering to keep your audio signal clean and free of interference.
Prioritize converters that advertise high input voltage ranges and quality internal components for the best sound quality.
Bass Restoration Features
Many factory radios apply a bass roll-off when volume is increased to protect stock speakers. Converters with bass restoration technology like AccuBASS or BassLift restore these low frequencies so your subwoofer receives a full signal.
If your goal is deep bass choose a unit that explicitly mentions bass correction or restoration in its features.
Installation Ease and Size
Consider the physical size of the converter as you will likely need to mount it under a seat or in a trunk. Slim and compact designs are easier to hide and install in tight spaces without interfering with other car components.
Select a unit that has clearly labeled terminals and comes with a detailed wiring guide for a hassle-free installation.
Adjustability and Controls
Some converters offer gain knobs or remote controls that allow you to adjust the subwoofer level from the driver's seat. These features add convenience and make it easier to tune your system to match your music preferences on the fly.
Decide if you need this level of control based on how often you change your listening habits or setup.
Output Voltage and Channels
Ensure the converter provides the necessary number of outputs for your setup such as stereo RCA for two subwoofers or separate high and low outputs. Higher output voltage like 8 volts RMS can provide a stronger signal for high gain amplifiers.
Check the specifications to confirm the unit supports the channels and voltage your amplifier requires for optimal performance.
Build Quality and Warranty
Look for models with robust construction including metal housings or durable plastic casings that can withstand heat and vibration. A solid warranty and good customer support from the manufacturer also protect your investment against defects.
Choose a reputable brand known for quality car audio components to ensure long term reliability and service.
How to Use and Care for Your Line Out Converter Subwoofer
Install the converter close to your radio or amplifier to minimize signal loss and reduce the length of exposed wires. Use high quality connectors and secure them tightly to prevent vibration from loosening connections over time.
After installation test the system by playing bass heavy tracks at various volumes to ensure the converter switches the amp on and off correctly. Adjust any gain knobs on the unit to match the sensitivity of your amplifier for clean sound.
Check the wiring periodically for signs of wear or corrosion especially if your vehicle is in a humid or salty environment. Keeping the converter away from direct heat sources will also help maintain its performance and extend its lifespan.
Frequently Asked Questions
Do I need a line out converter for my factory car?
Yes if your factory radio does not have RCA outputs and you want to connect an aftermarket amplifier. The converter changes the speaker wire signal to a line level signal that the amp can understand.
What is the difference between passive and active converters?
Passive converters use resistors to drop voltage and do not require power. Active converters use internal electronics to buffer and clean the signal which often results in better sound quality and lower noise.
Can I install a line out converter myself?
Yes many models are designed for DIY installation with simple wiring instructions. You will need to tap into speaker wires and connect RCA cables to the amplifier which is manageable for most car owners.
Will a converter damage my factory radio?
No a properly rated converter should not damage your radio. It is designed to handle factory output voltages and provides a load that some radios need to function correctly with speakers connected.
Why does my subwoofer cut in and out?
This is often caused by an unreliable remote turn-on signal. Check if your converter is generating a stable signal or if the amplifier is not getting enough power from its ground and power wires.
Do line out converters have bass controls?
Some do and some do not. Basic models convert signals passively while advanced units may include gain knobs or separate bass and high output controls for better tuning flexibility.
Final Thoughts on Choosing the Best Line Out Converter Subwoofer
The AudioControl LC2i and Kicker 46KISLOC2 stand out as top choices for enthusiasts seeking high performance and budget friendly reliability respectively. These models cover the majority of use cases from simple installs to advanced tuning requirements.
When deciding prioritize the features that matter most to your specific setup such as bass restoration or remote knobs. Ensure the unit you pick matches the power and signal needs of your factory radio and amplifier to avoid issues.
Always verify the latest pricing and availability before buying since product costs and stock can change. With the right converter you can enjoy deep clean bass in your car without replacing your stock head unit.